/* ==========================================================================
   OmniTrade Landing Page - Premium Design System v4
   Award-winning aesthetic inspired by Coinbase, Stripe, Linear
   ========================================================================== */

/* CSS Custom Properties (Design Tokens)
   ========================================================================== */
:root {
  /* Colors - Premium Blue Palette */
  --color-primary: #3B82F6;
  --color-primary-dark: #2563EB;
  --color-primary-darker: #1D4ED8;
  --color-primary-light: #EFF6FF;
  --color-primary-glow: rgba(59, 130, 246, 0.15);
  
  /* Neutrals */
  --color-text: #0F172A;
  --color-text-secondary: #475569;
  --color-text-muted: #94A3B8;
  --color-background: #FAFBFC;
  --color-white: #FFFFFF;
  --color-border: #E2E8F0;
  --color-border-light: #F1F5F9;
  
  /* Accents */
  --color-success: #10B981;
  --color-terminal-bg: #0F172A;
  --color-terminal-header: #1E293B;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', SFMono-Regular, ui-monospace, Consolas, monospace;
  
  /* Font Sizes - Premium Scale */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1.125rem;
  --text-lg: 1.25rem;
  --text-xl: 1.5rem;
  --text-2xl: 1.875rem;
  --text-3xl: 2.5rem;
  --text-4xl: 3rem;
  --text-5xl: 4rem;
  --text-6xl: 4.5rem;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;
  
  /* Layout */
  --container-max: 1200px;
  --container-padding: var(--space-6);
  --section-padding: 100px;
  
  /* Effects */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 24px 48px rgba(0, 0, 0, 0.12);
  --shadow-terminal: 0 32px 64px rgba(15, 23, 42, 0.24);
  --shadow-glow: 0 0 60px var(--color-primary-glow);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-2xl: 28px;
  --radius-full: 9999px;
}

/* Reset & Base
   ========================================================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
}

img, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* Layout
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* Full-Screen Sections */
.section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: var(--section-padding) 0;
  position: relative;
}

.section--alt {
  background-color: var(--color-white);
}

.section--compact {
  min-height: auto;
  padding: 80px 0;
}

.section > .container {
  width: 100%;
}

/* Animation Classes
   ========================================================================== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.fade-in-delay-1 { transition-delay: 0.1s; }
.fade-in-delay-2 { transition-delay: 0.2s; }
.fade-in-delay-3 { transition-delay: 0.3s; }
.fade-in-delay-4 { transition-delay: 0.4s; }
.fade-in-delay-5 { transition-delay: 0.5s; }

/* Header
   ========================================================================== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(250, 251, 252, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border-light);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.logo__symbol {
  color: var(--color-primary);
  flex-shrink: 0;
}

.logo__text {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.header__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.header__link:hover {
  color: var(--color-primary);
}

.header__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-white);
  background: var(--color-text);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

.header__cta:hover {
  background: var(--color-primary);
  transform: translateY(-1px);
}

.header__cta svg {
  width: 18px;
  height: 18px;
}

/* Hero Section
   ========================================================================== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 72px;
  overflow: hidden;
  background: linear-gradient(180deg, var(--color-background) 0%, var(--color-white) 100%);
}

.hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-12);
  align-items: center;
}

@media (min-width: 1024px) {
  .hero__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-20);
  }
}

.hero__content {
  max-width: 560px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  margin-bottom: var(--space-8);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  background: var(--color-primary-light);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.hero__title {
  font-size: clamp(3rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.035em;
  margin-bottom: var(--space-6);
  color: var(--color-text);
}

.hero__title span {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-10);
  max-width: 440px;
}

.hero__buttons {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

/* Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
  font-weight: 600;
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.btn--primary {
  color: var(--color-white);
  background: var(--color-primary);
  box-shadow: var(--shadow-md), 0 4px 14px rgba(59, 130, 246, 0.25);
}

.btn--primary:hover {
  background: var(--color-primary-dark);
  box-shadow: var(--shadow-lg), 0 8px 24px rgba(59, 130, 246, 0.35);
  transform: translateY(-2px);
}

.btn--secondary {
  color: var(--color-text);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}

.btn--secondary:hover {
  background: var(--color-background);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.btn__icon {
  width: 20px;
  height: 20px;
}

/* Terminal
   ========================================================================== */
.terminal {
  background: var(--color-terminal-bg);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-terminal);
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 14px;
}

.terminal__header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-5);
  background: var(--color-terminal-header);
}

.terminal__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.terminal__dot--red { background: #EF4444; }
.terminal__dot--yellow { background: #F59E0B; }
.terminal__dot--green { background: #10B981; }

.terminal__title {
  flex: 1;
  text-align: center;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
}

.terminal__body {
  padding: var(--space-6) var(--space-8);
  line-height: 1.9;
  color: #E2E8F0;
}

.terminal__prompt {
  color: var(--color-primary);
  font-weight: 600;
}

.terminal__command {
  color: #FFFFFF;
}

.terminal__output {
  color: #94A3B8;
}

.terminal__banner {
  color: var(--color-primary);
  white-space: pre;
  line-height: 1.4;
  margin: var(--space-4) 0;
  font-size: 13px;
  opacity: 0.95;
}

.terminal__cursor {
  display: inline-block;
  width: 10px;
  height: 18px;
  background: var(--color-primary);
  animation: blink 1s infinite;
  vertical-align: middle;
  margin-left: 4px;
  border-radius: 2px;
}

@keyframes blink {
  0%, 45% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

/* Conversation Demo
   ========================================================================== */
.conversation {
  max-width: 800px;
  margin: 0 auto;
}

.conversation__title {
  text-align: center;
  font-size: var(--text-4xl);
  font-weight: 800;
  margin-bottom: var(--space-4);
  letter-spacing: -0.03em;
}

.conversation__subtitle {
  text-align: center;
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-16);
}

.chat {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.chat__message {
  display: flex;
  gap: var(--space-4);
  max-width: 90%;
}

.chat__message--user {
  align-self: flex-end;
  flex-direction: row-reverse;
}

.chat__message--assistant {
  align-self: flex-start;
}

.chat__avatar {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--text-sm);
}

.chat__avatar--user {
  background: var(--color-primary-light);
  color: var(--color-primary);
}

.chat__avatar--assistant {
  background: linear-gradient(135deg, #D97706 0%, #F59E0B 100%);
  color: white;
}

.chat__bubble {
  padding: var(--space-5) var(--space-6);
  border-radius: var(--radius-xl);
  line-height: 1.6;
  font-size: var(--text-base);
}

.chat__message--user .chat__bubble {
  background: var(--color-primary);
  color: white;
  border-bottom-right-radius: var(--radius-sm);
}

.chat__message--assistant .chat__bubble {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-bottom-left-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

.chat__table {
  width: 100%;
  margin-top: var(--space-4);
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.chat__table th,
.chat__table td {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.chat__table th {
  font-weight: 600;
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.chat__gain {
  color: var(--color-success);
  font-weight: 700;
}

.chat__order {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  font-size: var(--text-sm);
}

.chat__order-status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-success);
  font-weight: 700;
}

/* Features
   ========================================================================== */
.features__header {
  text-align: center;
  margin-bottom: var(--space-20);
}

.features__title {
  font-size: var(--text-4xl);
  font-weight: 800;
  margin-bottom: var(--space-4);
  letter-spacing: -0.03em;
}

.features__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

.features__grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .features__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.feature-card {
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2xl);
  padding: var(--space-10);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.feature-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-lg), var(--shadow-glow);
  transform: translateY(-6px);
}

.feature-card__icon {
  width: 56px;
  height: 56px;
  margin-bottom: var(--space-6);
  color: var(--color-primary);
}

.feature-card__title {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
  letter-spacing: -0.01em;
}

.feature-card__desc {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* Exchange Logos
   ========================================================================== */
.exchanges {
  text-align: center;
}

.exchanges__title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: var(--space-10);
}

.exchanges__logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--space-10);
}

.exchanges__logo {
  height: 32px;
  width: auto;
  filter: grayscale(100%);
  opacity: 0.5;
  transition: all var(--transition-base);
}

.exchanges__logo:hover {
  filter: grayscale(0%);
  opacity: 1;
}

/* How It Works
   ========================================================================== */
.how-it-works__title {
  text-align: center;
  font-size: var(--text-4xl);
  font-weight: 800;
  margin-bottom: var(--space-20);
  letter-spacing: -0.03em;
}

.steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  position: relative;
}

@media (min-width: 768px) {
  .steps {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-16);
  }

  .steps::before {
    content: '';
    position: absolute;
    top: 48px;
    left: calc(16.67% + 48px);
    right: calc(16.67% + 48px);
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary-light) 50%, var(--color-primary) 100%);
    opacity: 0.3;
  }
}

.step {
  text-align: center;
  position: relative;
}

.step__number {
  width: 96px;
  height: 96px;
  margin: 0 auto var(--space-8);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--color-primary);
  background: var(--color-primary-light);
  border-radius: var(--radius-full);
  position: relative;
  z-index: 1;
}

.step__title {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.step__desc {
  color: var(--color-text-secondary);
  margin-bottom: var(--space-5);
}

.step__code {
  display: inline-block;
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  background: var(--color-terminal-bg);
  color: var(--color-primary);
  border-radius: var(--radius-md);
}

/* Example Prompts
   ========================================================================== */
.prompts__title {
  text-align: center;
  font-size: var(--text-4xl);
  font-weight: 800;
  margin-bottom: var(--space-4);
  letter-spacing: -0.03em;
}

.prompts__subtitle {
  text-align: center;
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-16);
}

.prompts__grid {
  display: grid;
  grid-template-columns: repeat(1, 1fr);
  gap: var(--space-4);
}

@media (min-width: 640px) {
  .prompts__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .prompts__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.prompt-card {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-6);
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  font-size: var(--text-sm);
  color: var(--color-text);
  transition: all var(--transition-base);
  cursor: pointer;
}

.prompt-card:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.prompt-card__icon {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  color: var(--color-primary);
}

.prompt-card__copy {
  flex-shrink: 0;
  width: 18px;
  height: 18px;
  margin-left: auto;
  color: var(--color-text-muted);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.prompt-card:hover .prompt-card__copy {
  opacity: 1;
}

/* Security
   ========================================================================== */
.security {
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}

.security__icon {
  width: 80px;
  height: 80px;
  margin: 0 auto var(--space-8);
  color: var(--color-success);
}

.security__title {
  font-size: var(--text-4xl);
  font-weight: 800;
  margin-bottom: var(--space-4);
  letter-spacing: -0.03em;
}

.security__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-12);
}

.security__list {
  display: inline-flex;
  flex-direction: column;
  gap: var(--space-5);
  text-align: left;
}

.security__item {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  font-size: var(--text-lg);
}

.security__check {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  color: var(--color-success);
}

/* CTA Section
   ========================================================================== */
.cta {
  text-align: center;
  background: linear-gradient(180deg, var(--color-background) 0%, var(--color-primary-light) 100%);
}

.cta__title {
  font-size: var(--text-5xl);
  font-weight: 800;
  margin-bottom: var(--space-4);
  letter-spacing: -0.03em;
}

.cta__subtitle {
  font-size: var(--text-xl);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-10);
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.cta__install {
  display: inline-flex;
  align-items: center;
  gap: var(--space-5);
  padding: var(--space-5) var(--space-8);
  background: var(--color-terminal-bg);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-8);
  box-shadow: var(--shadow-lg);
}

.cta__code {
  font-family: var(--font-mono);
  font-size: var(--text-base);
  color: var(--color-primary);
}

.cta__copy {
  padding: var(--space-2);
  color: var(--color-text-muted);
  transition: all var(--transition-fast);
  border-radius: var(--radius-sm);
}

.cta__copy:hover {
  color: var(--color-white);
  background: rgba(255, 255, 255, 0.1);
}

.cta__links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-8);
  font-size: var(--text-base);
  color: var(--color-text-secondary);
}

.cta__link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  transition: color var(--transition-fast);
}

.cta__link:hover {
  color: var(--color-primary);
}

.cta__link svg {
  width: 22px;
  height: 22px;
}

/* Footer
   ========================================================================== */
.footer {
  padding: var(--space-16) 0;
  background: var(--color-white);
  border-top: 1px solid var(--color-border);
}

.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-8);
  text-align: center;
}

@media (min-width: 768px) {
  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.footer__logo .logo__symbol {
  color: var(--color-primary);
}

.footer__logo .logo__text {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
}

.footer__text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.footer__text a {
  color: var(--color-primary);
  font-weight: 500;
}

.footer__text a:hover {
  text-decoration: underline;
}

.footer__links {
  display: flex;
  gap: var(--space-8);
}

.footer__link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-primary);
}

/* Toast / Notification
   ========================================================================== */
.toast {
  position: fixed;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: var(--space-4) var(--space-6);
  background: var(--color-text);
  color: var(--color-white);
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-full);
  box-shadow: var(--shadow-xl);
  opacity: 0;
  transition: all var(--transition-base);
  z-index: 200;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* Responsive
   ========================================================================== */
@media (max-width: 767px) {
  :root {
    --section-padding: 60px;
  }
  
  .header__nav {
    display: none;
  }
  
  .hero {
    padding-top: 100px;
    min-height: auto;
    padding-bottom: var(--space-16);
  }
  
  .section {
    min-height: auto;
  }
  
  .terminal {
    font-size: 12px;
  }
  
  .terminal__banner {
    font-size: 11px;
  }
  
  .hero__title {
    font-size: 2.5rem;
  }
  
  .conversation__title,
  .features__title,
  .how-it-works__title,
  .prompts__title,
  .security__title,
  .cta__title {
    font-size: var(--text-3xl);
  }
}